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Finding the Fourth Proportional to 826.53, 1,239.45 and 517.92

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Solution

The fourth proportional to 826.53, 1,239.45 and 517.92 is: 776.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    826.53 : 1,239.45 = 517.92 : x
  2. Step 2: Convert to fraction form
    826.53/1,239.45 = 517.92/x
  3. Step 3: Cross multiply
    826.53x = 1,239.45 × 517.92
  4. Step 4: Simplify right side
    826.53x = 641,935.94
  5. Step 5: Solve for x
    x = 641,935.94/826.53
  6. Step 6: Final answer
    x = 776.66

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.